I worked as hard as I could _______ for the final exam.
#94487
A
to prepare
B
prepare
C
preparing
D
prepared
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 The machine has been made easier for it____.
#94295
A
to operate
B
operated
C
being operated
D
to be operated
Having lost his key,________.
#91037
A
he couldn’t enter the room
B
the gatekeeper offered to help
C
the door was forced open
D
the room couldn’t be entered